Airplane



FIG. 1 is a top plan view of an airplane showing my new design;

FIG. 2 is a side elevational view of FIG. 1, the other side being identical;

FIG. 3 is a front elevational view of FIG. 1;

FIG. 4 is a rear elevational view of FIG. 1;

FIG. 5 is a side elevational view similar to FIG. 2, but with the engines in an alternate position, and

FIG. 6 is a front elevational view of FIG. 5. 

The ornamental design for an airplane, substantially as shown and described. 